Table 3.

Qualitative feedback regarding acceptability.

Theme and subtheme		Supporting examples (participant number)
Helpfulness for managing anxiety		“I enjoyed the games and thought the game gave quite good techniques.” [P13] “During the games where you had to keep your heart rate down, and breathing exercises, I did find ways to slow down my breathing, and calm my heart rate, which was good.” [P8] “It taught me a lot of breathing skills.” [P14] “The game points out very helpful things that you don’t really think about.” [P15]
Ease and enjoyment of use
	Positive feedback
		“The game was fairly easy to control and fairly smooth running.” [P5] “It was informative and the animations were fun.” [P4] “The heart rate monitor was fun - to see where my heart was at.” [P1] “It was really fun and I would do it again.” [P18]
	Negative feedback
		“The game was too difficult in module 3.” [P4] “Bit too much talking and felt like module 2 was the same as module 1.” [P20] “I don’t feel like the game was for my age (15 years) and not enough shooting.” [P5]